Motor driven sprocket actuated machine wrench



'March 4, 1958 Y. E. J.. ROBERTS 2,825,25

MOTOR DRIvEN sPRocKET ACTUATED MACHINE WRENCH Filed Feb. 1B, 1957ZISheets-Sheet 1 www No om INVENTOR March 4 1195s 1 E. J1, @ER-fsf Y2,825,252

MOTOR DRIVEN SPRCKET CTTED MACHINE WRENCH Filed F'eb. 18, 1957 i 2Sheets-Sheet 2 y Tg2 Ng INVNTOR.-

United States Patent O MOTOR DRIVEN SPROCKET ACTUATED MACHINE WRENCHEdward J. Roberts, Hampton, Va. Application February 1s, 1957, serialNo. Massa 2 claims. (Cl. 81-57) This invention relates to machine toolsand more particularly to a wrench for use on lfreight class types oflocomotives.

It is an object of the present invention to provide a wrench forslacking off and taking up on the brake adjusting screw of locomotivebrake shoes.

it is another object of the present invention to provide an automaticwrench of the above type for removing the brake shoes of various typesof locomotives efficiently and effectively with a minimum amount ofmanual labor.

Other objects of the invention are to provide an automatic wrenchbearing the above objects in mind which is of simple construction, has aminimum number of parts, is inexpensive to manufacture and eflicient inoperation.

For other objects and for better understanding of the invention,reference may be had to the following detailed description taken inconjunction with the accompanying drawing, in which:

Figure 1 is a side elevational view, with parts broken away, of anautomatic wrench made in accordance with the present invention;

Figure 2 is a top plan view of the device shown in Figure 1;

Figure 3 is an enlarged cross sectional view taken along line 3-3 ofFigure 2; and

Figure 4 is an enlarged cross sectional view taken along line 4-4 ofFigure 2.

Referring now to Figure l of the drawing, an automatic wrench made inaccordance with the present inventon is shown to include a substantiallyrigid base frame that is supported in a horizontal position upon a pairof downwardly diverging adjustable legs 12 at one end and a downwardlydepending single leg 13 at the opposite end. A housing 15 having anupwardly extending carrying handle 11 is integrally secured to the baseframe 10 and includes a longitudinally extending shield 17.

As is more clearly shown in Figure 3, the shield 17 is provided with apair of oppositely and outwardly extending circular flanges 19 thatrotatably support a sprocket wheel 20. This sprocket wheel 20 has aplurality of sprocket teeth 23 and defines a central hexagonal opening22 that is adapted to removably receive the nut or bolt head of alocomotive device. A sprocket chain 25 is trained about the sprocketwheel 20 at one end and is in driven engagement with a drive sprocket 26at the opposite end. The drive sprocket is secured to a rotatable shaft27 that has a bevel gear 27 secured at one end. An intermediate idlershaft 30 has a bevel gear 29 at one end in meshing engagement with thebevel gear 28 upon the sprocket shaft and another bevel gear 31 at theopposite end in meshing engagement with a similar bevel gear 33 securedto the rotor shaft 34 of the rotor 35 of a pneumatic motor 36.

The pneumatic drive motor 36 is supplied with pres- ICC sure uid througha supply line 4t) and directional control valves 41, 42, that controlthe direction of rotation of the rotor 35. A connecting link 43 isoperatively secured to both valves 41, 42, so as to synchronize theirmovement, in response to actuation of the operating handle 44.

Thus, in operation, the nut to be driven is engaged -by the drivensprocket 20, whereupon the operating handle 44 is moved so as to openthe associated valves 41, 42, so that fluid enters the motor housing 36to drive the rotor 35 in a predetermined direction, depending uponwhether the nut is to be tightened or loosened. Rotation of the rotor 35is operative to effect rotation of the sprocket 26 which in turn, drivesthe sprocket wheel 20 through the sprocket chain 25. All of the legs areadjustable so as to permit the device to be used on various types ofequipment, and is provided with the carrying handle 11 so as tofacilitate the adjustment thereof.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of theUnited States is:

1. A motor operated gearing controlled wrench for driving nutscomprising, in combination, a base frame having a pair of spacedparallel guard plates, a circular opening in each oneof said guardplates, a circular flange extending outwardly from the opening definingportions of each of said circular openings defining circular bearings, adriven sprocket wheel having a centrally located nut socket withoutwardly extending shoulders in rotatable engagement with said circularflanges, a drivingY e sprocket wheel, a sprocket chain drivinglyconnecting said driving sprocket wheel to said driven sprocket wheel,and a pneumatic motor supported upon said base frame in drivingengagement with said driving sprocket wheel, adjustable support meansfor said base frame including a pair of downwardly diverging legs at onelongitudinal end of said frame and a downwardly extending leg at theopposite longitudinal end of said frame, said driven sprocket wheel andsaid driving sprocket wheel together with said pneumatic motor beingmounted in spaced longitudinal alignment upon said base frame, saidpneumatic motor comprising pneumatic supply means, a valve for supplyingpneumatic pressure from said supply means to drive said motor in onedirection, a valve for supplying pneumatic pressure from said supplymeans to drive said motor in a reverse direction, linkage connectingsaid valves for selectively controlling the direction of flow to saidmotor, and bevel gears drivingly connecting said motor to said drivingsprocket.

2. The combination according to claim l, wherein said linkage isoperative to simultaneously operate both of said valves to drive saidmotor in either direction in response to actuation of said linkage in asingle predetermined direction.

References Cited in the file of this patent Andersen May 22, 1956

